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erofs: introduce z_erofs_do_decompressed_bvec()

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Both out_bvecs and in_bvecs share the common logic for decompressed
buffers. So let's make a helper for this.

Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220715154203.48093-15-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang 2022-07-15 23:42:01 +08:00
parent fe3e5914e6
commit 3fe96ee0f9
1 changed files with 22 additions and 27 deletions
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49
fs/erofs/zdata.c
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@ -861,6 +861,26 @@ struct z_erofs_decompress_backend {
unsigned int onstack_used;
};
static int z_erofs_do_decompressed_bvec(struct z_erofs_decompress_backend *be,
struct z_erofs_bvec *bvec)
{
unsigned int pgnr = (bvec->offset + be->pcl->pageofs_out) >> PAGE_SHIFT;
struct page *oldpage;
DBG_BUGON(pgnr >= be->pcl->nr_pages);
oldpage = be->decompressed_pages[pgnr];
be->decompressed_pages[pgnr] = bvec->page;
/* error out if one pcluster is refenenced multiple times. */
if (oldpage) {
DBG_BUGON(1);
z_erofs_page_mark_eio(oldpage);
z_erofs_onlinepage_endio(oldpage);
return -EFSCORRUPTED;
}
return 0;
}
static int z_erofs_parse_out_bvecs(struct z_erofs_decompress_backend *be)
{
struct z_erofs_pcluster *pcl = be->pcl;
@ -871,27 +891,14 @@ static int z_erofs_parse_out_bvecs(struct z_erofs_decompress_backend *be)
z_erofs_bvec_iter_begin(&biter, &pcl->bvset, Z_EROFS_INLINE_BVECS, 0);
for (i = 0; i < pcl->vcnt; ++i) {
struct z_erofs_bvec bvec;
unsigned int pgnr;
z_erofs_bvec_dequeue(&biter, &bvec, &old_bvpage);
if (old_bvpage)
z_erofs_put_shortlivedpage(be->pagepool, old_bvpage);
pgnr = (bvec.offset + pcl->pageofs_out) >> PAGE_SHIFT;
DBG_BUGON(pgnr >= pcl->nr_pages);
DBG_BUGON(z_erofs_page_is_invalidated(bvec.page));
/*
* currently EROFS doesn't support multiref(dedup),
* so here erroring out one multiref page.
*/
if (be->decompressed_pages[pgnr]) {
DBG_BUGON(1);
z_erofs_page_mark_eio(be->decompressed_pages[pgnr]);
z_erofs_onlinepage_endio(be->decompressed_pages[pgnr]);
err = -EFSCORRUPTED;
}
be->decompressed_pages[pgnr] = bvec.page;
err = z_erofs_do_decompressed_bvec(be, &bvec);
}
old_bvpage = z_erofs_bvec_iter_end(&biter);
@ -911,7 +918,6 @@ static int z_erofs_parse_in_bvecs(struct z_erofs_decompress_backend *be,
for (i = 0; i < pclusterpages; ++i) {
struct z_erofs_bvec *bvec = &pcl->compressed_bvecs[i];
struct page *page = bvec->page;
unsigned int pgnr;
/* compressed pages ought to be present before decompressing */
if (!page) {
@ -933,18 +939,7 @@ static int z_erofs_parse_in_bvecs(struct z_erofs_decompress_backend *be,
err = -EIO;
continue;
}
pgnr = (bvec->offset + pcl->pageofs_out) >> PAGE_SHIFT;
DBG_BUGON(pgnr >= pcl->nr_pages);
if (be->decompressed_pages[pgnr]) {
DBG_BUGON(1);
z_erofs_page_mark_eio(
be->decompressed_pages[pgnr]);
z_erofs_onlinepage_endio(
be->decompressed_pages[pgnr]);
err = -EFSCORRUPTED;
}
be->decompressed_pages[pgnr] = page;
err = z_erofs_do_decompressed_bvec(be, bvec);
*overlapped = true;
}
}